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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b749d89d04680e5db3860ff70a733a688ad0083bb0b2e308c8373df653748a63' 
  AND token = 'LdbMIsI4cQzLKW2e7bpKhO62tHcwiPGPh43xKv4ca1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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