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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b950f3e2f4c66fd794f82e7c298538070b7b13e52eb08d0142d60db238ba9407' 
  AND token = 'iu5ChpUreciIKPQNVOxG9MhpWGTPvDyeSK/YAu3IpFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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