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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ffc11bccdbb9fb5025c4767aae96b21fafb9b86e98f53646b19cd4c3ebac82b' 
  AND token = 'r6Ja4C0ZvN2m71Gx87oT9UxqzBEAc6D/TGMpH5BXqr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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