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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5b661108583797f1626f32fa35368ff02e5e8c05abcd51b0499346070b25861' 
  AND token = 'QdMr31jJsenblHyQjif+k/XrGR73L6dlM8bwqSUz1M8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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