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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41d9a4e3c240d1f2f2a294d32e0d57589809e0f3b1d4476bc031d6564b3a0198' 
  AND token = 'PbQ63I8cpR3tq9dnSR2slyIKkqN5E5cMIjGcMCSrcEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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