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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad347543e861aa6eb2f256ef9f149de878e74f8090b1df3f9429a6b432f4ad1c' 
  AND token = 'AsKxFHaJymntDulg+VngVYP+yMNXR1VerjeOPnb1Cfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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