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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a814916c024a8c6e7351a9e61d7f510b0a5901cb4b02574ada416813843f60d' 
  AND token = '0kWvnp91JkTHD9mM+1D8A0RMTFENHcVrbrYJJRQnHn4=' 
  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"
    }
  }
}