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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86e91a91e5fb400ba277e3605325c1b2e75ab92ef1b16e64ee28e70d62d56df9' 
  AND token = 'VXTW6f8MeEyqmVV6NTwe75rb29JKoDLGATPFK+ZYq60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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