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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aec356d562da2f0f5fc703796121bc0f0e10049ecfa570bb0ebec66fb8812f64' 
  AND token = 'rPc0P0XP6CfrHve8pbF1RtXE6WvAj1Ve4mCgXUgZ1SE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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