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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07a8814e7ca1ff8f5ac0204bba42e864a4c903f0f7e5db408f22fe983b46234f' 
  AND token = 'g8d3zK0c2MkDnOQ97It8FzgaphqBLxNS8Bva32UwGK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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