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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afbc1f7d1c433a62f23bc51d3a28b4a54766e9e99d048340f2bd02c8d658d38b' 
  AND token = 'Zmr98gIjeb8QrjDPaSi7VLr8+//z3SAzGLr6+5rMZKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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