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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fd6db5eb31bb88db2d4adcab1c3aed25863639b77f7554eaefc8baa53f05c60' 
  AND token = 'PIhZCraRQavy7w+7Sg08APzOhmF7r8VTTN38hs7Xmuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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