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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f13d9fad5e3293aaeb379bba7e2ca9adc36b0c46b4f091d8c22abe6700d469bf' 
  AND token = 'etk6XrmVC5NOOvD7ZUq7Rb6kFhaD/uLAGC5zu/W75ng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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