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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be96911d3621f1febb79dc0808e8c8e2179566bd1fb02fee5d2367b29d6ba8f6' 
  AND token = 'BRPwATau/X9nSo2QHE1I5ELfxrWoqw60Ncx6+AkfSGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}