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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcb7eb5d6047e31c5d153fbb06466b24b37dbd7856dcf19f12eba5a510fb27a6' 
  AND token = 'W3T1KsZIX9bsZBo1oVEJ2W+Q5vDyQfsGlmMbRDB52ds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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