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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0499ac2fad3e3c2de48bb135c26782e647b54b9dce9bb018344d702f21b11d14' 
  AND token = 'Gk8hRrCC8W1weZyyg4li+FEI5I5qsTQ+9M00lInMiC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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