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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a77e7f8d6ca31f0b518279e3c1e6b68adfd69c3837e8e251378db5635b7ae71e' 
  AND token = 'HYbhrL0xXl+EJoAgDS1bl5Mj4XTRfevaYC6mV9aVziA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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