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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faedef85e29ea1786789c5a1039676bf7387b93df6a2fc60710f6866e4f01f8a' 
  AND token = 'blksJ2jBP4kyA6Yjxwja/3RDKwNqKy0CI1iVcox3cRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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