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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2b8dbbd901b03b39327096eba6d87b83e9eb2e9c3b52401b600146dcbad2b49' 
  AND token = 'Fg5/vcFkGuFY5IPSaH2/Os35kThb8hP2FKJmtlWxdVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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