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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a68a1926f3561966a16f19197bca62e4802af9f9cfe05f637b24ecf16773af3' 
  AND token = 'tkyAyMV8lsR12Nx+aI655+yqUiTrhyih1F2ZKDAkwQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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