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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f08b10f7eb67cdd63324ddfbecfd057e76ebbd875826684db027e8f485e77df9' 
  AND token = '6lo7BPjQPVD73pBiQcPohKD2bwk8Q1DSfZL0yf7raoI=' 
  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"
    }
  }
}