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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a466be6c1b0af19c2fe0f1b29db2c6fd3a7659d6857c08ac420374ce950f732' 
  AND token = 'dfAdLrUZFzt9mD6XMIsjMFXhufZ3AFY/X9OT8yoiXJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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