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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16cf40849f39ce9d3bae66d830c0045e8df2b50add54d666f531fcdf1c05dae3' 
  AND token = 'j2me068fUh9QKjfRDv04eBYmzWvwI8mML1Q1c93LtNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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