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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cc9c843d2a28b191e3749eade5e541fa25e59409ca0edafa66eaad53a1767cc' 
  AND token = 'R41N4+K5d/j/572oSgo4DcrvWUoZGYeVpARVll3HIXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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