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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1d0adf38278b04fb92e98eb4088e79358fbfe400121f299f3548e0860c23e9e' 
  AND token = 'bOZHkCPGmvYJfF0UEpfBBL2fAm2RGHTXVBfVnljxqzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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