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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2f0448ac2cbe108309a0ab46d93588eac83cfe6fd0b319b0fc541e7b81712d9' 
  AND token = 'nND+Ntn3p+EHNkwrhqpxcxr7v3H2zHZg8tslQLho/oI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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