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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c122a78fe780feaf4e9717838dad6cc03d64aab079e57a7f7f8df5d6ac7057ca' 
  AND token = '69oYrg5vShoVUMs/F5XvSWcM3/QC2NFc7v4glIT+dVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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