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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '313f0b7342bba428f2520a1f3f95bda82476acf7e24e2a763f6916f56fcd5257' 
  AND token = 'PIT2AOJj5o6fYkqmlTfdWtk5VZGY3kUXIHozr4akq3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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