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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1edfcc13fa5fe06bc0defc7327c472e4b0a466a5c5d5a2a8111359704e6e9c9' 
  AND token = 'zVCJC1UxXF6jXGTbq/Hi7k9gUlFzsI7qr1dEPrx1eCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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