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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82ae511dfeb2f15c95d923258e27153642ff95e04fd80f9bd798e773229945fb' 
  AND token = 'NteayHBHFcsPlNmADUv8gJCINvJXNuHXGRnTdQR0u6A=' 
  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"
    }
  }
}