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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6a40fa8ae3c6f719fbbfc3b47d077fa836577a2d424d892d133c7f956a1aafe' 
  AND token = 's6ZZbsaBgt4UFwe8oTHMCkUILLj2fbl2JcfPa9Nme/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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