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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d06dc38e9ca7405b9e81b4d17dc8c3b466cf6ce694c1085cb4c95b48977221c' 
  AND token = '14P5Oy5vb/ygRSwSEJxY8Jr3O7KhlCcFV/AxZKanEvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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