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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39f26e8dddbbdae9b177c146fdcab461bddabf7c40a76c58973ba2a33682ddbf' 
  AND token = 'k954U7011a7o2m+HaFctW26i5kSbhadAffMA40z31cI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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